Technologies Coding Problems Bookmarks Learning Paths

Technologies Coding Problems Bookmarks Learning Paths

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Questions

1 of 13

1How to drop a table?

2How to create tables?

3How to list tables in a database?

4What are derived tables?

5How to truncate a table?

6How to rename a table?

7how to add and delete columns in an existing table?

8How do we repair tables?

9What are Temporary Tables?

10How to lock tables and why do we need to lock a table?

11How to clone tables in mysql?

12How to get information about the table?

13How to modify the structure of a table?

mysql

Functions and Operators

01 / 13

How to drop a table? | Tables | mysql Interview Questions | NextRound.in

How to drop a table?

Difficulty: 4/10

DROP TABLE syntax, foreign key constraints, data retention

DROP TABLE statement is a Data Definition Language (DDL) command that is used to remove a table's definition, and its data, indexes, triggers, constraints and permission specifications (if any).

Syntax:

Scenario Questions

0-2 years experience

1You need to remove a temporary table called `temp_orders` after a batch job finishes. How would you write the MySQL statement, and what would you do to ensure it doesn't error if the table doesn't exist?
2If you run `DROP TABLE users;` on a production database, what immediate effect does it have on the data and any dependent objects?

2-5 years experience

1Our feature creates a `user_sessions` table with foreign keys to `users`. We now need to drop it as part of a refactor, but the deployment is failing. How would you safely drop the table without breaking the foreign key constraints?
2During a rollback, we discovered that a `DROP TABLE` was accidentally executed on a table that had a large amount of data. What steps would you take to investigate and possibly recover the data, assuming we have binary logs enabled?

5-8 years experience

1We have a multi‑tenant SaaS platform where each tenant's data lives in separate tables named `tenant_<id>_orders`. We need to drop a tenant's tables when they cancel. How would you design a process that drops these tables efficiently while minimizing lock contention and ensuring no accidental data loss across tenants?
2Our data warehouse uses MySQL as a staging layer, and nightly jobs drop and recreate staging tables. At scale, we see performance spikes during the drop. What are the underlying reasons, and how would you mitigate them?

8+ years experience

1Our organization is migrating from a monolithic MySQL instance to a sharded architecture. Some legacy services still issue `DROP TABLE` commands directly. How would you establish governance and tooling to prevent accidental drops, while allowing controlled deprecation of tables across many services?
2We have a compliance requirement to retain audit logs for dropped tables for 7 years. Design a strategy that satisfies this requirement without keeping the full table data in the primary database.

Follow-up Questions

What happens to views or stored procedures that reference a table you drop?
Can you wrap a DROP TABLE in a transaction, and what are the implications?
How does MySQL handle foreign key checks when dropping a table that other tables depend on?

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